Regensburg 2025 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 13: Holistic Structural and Safety Assessment of Lithium-ion and Post-Lithium Cells and their Materials (Experimental Characterisation and Safety Testing)

KFM 13.5: Talk

Wednesday, March 19, 2025, 16:00–16:15, H9

Reversible Structural Evolution of 3D Vanadium Sulfide Anodes in Sodium-Ion Battery Applications — •Osamah Ali Fayyadh, Yulian Dong, Huaping Zhao, and Yong Lei — Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau

Sodium-ion batteries (SIBs) are a promising alternative to lithium-ion batteries due to sodium's abundance and wide distribution. However, SIBs face challenges such as low capacity, poor cycling, and sluggish ion diffusion, due to the large ionic radius of Na+. Thus, extensive research has focused on advanced anode materials, among which vanadium sulfides (VSx) have gained significant attention due to their large interlayer spacing, high theoretical capacities, and versatile electrochemical mechanisms. However,VSx suffer from mechanical pulverization, severe volume changes, and limiting their practical application. Here, we demonstrate a 3D micro/nanostructured VSx anode fabricated, achieving a remarkable reversible capacity of 961.4 mAh g-1 after 1500 cycles at 2 A g-1. The sodiation-driven reconfiguration of 3D-VSx into a stable structure mitigates volume changes, enhances ion diffusion, and improves structural stability.[1] The sodiation-driven reconfiguration enhances ion diffusion, mitigates volume changes, and stabilizes the structure. Electrochemical studies and density functional theory calculations reveal significantly improved Na+ storage capabilities, offering a pioneering strategy for developing high-performance SIB anodes with excellent capacity and stability. [1] Y. Dong, Y. Lei et.al. Adv. Energy Mater. 2023, 13, 2204324.

Keywords: Sodium-ion batteries; vanadium sulfides; sodiation-driven reconfiguration; high-performance